html, body, div, p, span, img, a, h1, h2, h3, h4, h5, h6, ul, li, dl, dt,
dd, form, input, select, textarea, fieldset, legend, table, tr, th, td {
    padding: 0;
    margin: 0;
    border: 0;
}
html{
  width: 100%;
}
body {
    font-size: 12px;
    font-family: Arial, Hiragino Sans GB, Microsoft YaHei, SimSun;
    color: #212121;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
ul {
    list-style-type: none;
}
a {
    text-decoration: none;
    outline: none;
    color: inherit;
}
:focus {
    outline: none;
}
input, button, textarea,
select, optgroup, option {
    font-weight: normal;
    font-family: inherit;
    font-size: inherit;
    font-style: inherit;
}
input, button, textarea,
select, optgroup, option {
    *font-size: 100%;   //此种写法是为了支持老版本的IE
}
.clear {
    clear: both;
    width: 0;
    height: 0;
    line-height: 0;
}
iframe {
    display: block;
}
